Have you upgraded from Domino 4.5 to 4.6, and all the users Mail files are
still using the 4.5 Mail Template?
From the Console type,
load convert <Directory\Mail File> <Current Template Used> <New Mail Template
load convert mail\*.nsf StdR45Mail mail46.ntf
This will convert all users using the Mail45 Template to the Mail46 Template
This is best run when there are no users on, or else users will get error
messages within notes when they are connected.